ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P202B, P202C

DTC Code DTC Name
P202B Reductant Tank Heater Control Circuit Low
P202C Reductant Tank Heater Control Circuit High

DESCRIPTION

An electric heater is provided inside the urea tank and urea pipe, as urea solution freezes at -11°C (12.2°F) or lower.

The heater thaws frozen urea solution and prevents further freezing, allowing the urea SCR system to be started even in cold environments.

The tank heater turns ON and OFF according to the value of the temperature sensor. The heater for the urea tube with heater assembly turns ON and OFF according to the value of the ambient temperature sensor.

P202B
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Reductant Tank Heater (Active Test)

When the tank heater is operating, an open or short circuit occurs in the tank heater for 3 seconds or more.

(1 trip detection logic)

  • Open or short in tank heater circuit

  • Tank heater (Urea Pump)

  • Urea pump control ECU
P202C
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Reductant Tank Heater (Active Test)

When the tank heater is operating, an open or short circuit occurs in the tank heater for 3 seconds or more.

(1 trip detection logic)

  • Open or short in tank heater circuit

  • Tank heater (Urea Pump)

  • Urea pump control ECU
Related Data List
DTC No. Data List

P202B

P202C

 Reductant Tank Heater

WIRING DIAGRAM

B001CMZE01

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. INSPECT TANK HEATER (UREA PUMP)


    1. Inspect the tank heater (urea pump) Click here.


    NG

    REPLACE UREA PUMP Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (TANK HEATER (UREA PUMP) - UREA PUMP CONTROL ECU))

    A01XJA5E02

    1. Disconnect the tank heater (urea pump) connector.

    2. Disconnect the urea pump control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      s2-9 (TH+) - s3-21 (HTT) Always Below 1 Ω
      s2-11 (TH-) - s3-31 (EHTT) Always Below 1 Ω
      s2-9 (TH+) or s3-21 (HTT) - Body ground and other terminals Always 10 kΩ or higher
      s2-11 (TH-) or s3-31 (EHTT) - Body ground and other terminals Always 10 kΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Tank Heater (urea pump))

      		 *b

      Front view of wire harness connector

      (to Urea Pump Control ECU)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR Click here

    OK

  3. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the engine switch off for 30 seconds or more.


    NEXT

  4. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Reductant Tank Heater .

    4. Perform the Active Test.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC P202B or P202C is output A
      DTCs is not output B

    B

    END

    A

  5. REPLACE UREA PUMP CONTROL ECU


    1. Replace the urea pump control ECU Click here.


    NEXT

  6. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the engine switch off for 30 seconds or more.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Reductant Tank Heater.

    4. Perform the Active Test.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Confirm that the DTC is not output again.


    NEXT

    END

  8. REPAIR OR REPLACE HARNESS AND CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CLEAR DTC Click here

  9. REPLACE UREA PUMP


    1. Replace the urea pump Click here.


    NEXT

    CLEAR DTC Click here